(1) a
superintendent, principal, teacher, including a substitute teacher,
supervisor, social worker, counselor, nurse, and teacher's aide
employed by a school district;(2) a teacher employed by a company that contracts with a school district to provide the teacher's services to the district;(3) a student in an education preparation program participating in a field experience or internship;(4) a
school bus driver certified in accordance with standards and
qualifications adopted by the Department of Public Safety of the State
of Texas;(5) a member of the board of trustees of an independent school district; and(6) any other person employed by a school district whose employment requires certification and the exercise of discretion.

(A) excessive use of
alcoholic beverages, as defined by Section 1.04, Alcoholic Beverage Code; and

(B) use of marihuana
or a controlled substance, as defined by Chapter 481, Health and Safety Code,
or by 21 U.S.C. Section 801 et seq., or a dangerous drug, as defined by Chapter
483, Health and Safety Code;

(2) require at least
one scheduled drug test for each prospective professional employee of a
district;

(3) authorize
random, unannounced drug testing once each year for not fewer than 10 percent
of the professional employees of a district; and

(4) require a drug
test for each professional employee of a district who is injured on the job.

A
school district is required to establish and administer a drug testing policy
under this section only if the legislature appropriates sufficient money
specifically for the purpose of reimbursing districts for expenses incurred in
establishing and administering the policy.